HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH 32-BIT
MULTIWIDTH™ BUS SWITCHES
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IDTQS34X2245
FEATURES:
Enhanced N channel FET with no inherent diode to Vcc
Bidirectional switches connect inputs to outputs
Zero propagation delay, zero ground bounce
Internal 25Ω resistors for low noise
Ω
Flow-through pinout for easy layout
Undershoot clamp diodes on all switch and control inputs
TTL-compatible control inputs
Available in 80-pin MilliPaQ™ package
APPLICATIONS:
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Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Bus switching and isolation
Power conservation
Logic replacement (data processing)
Capacitance isolation
Clock gating
The QS34X2245 is a member of the MultiWidth
TM
family of QuickSwitch
devices and provides a set of 32 high-speed CMOS compatible bus switches
in a flow-through pinout. This device is available in the MillipaQ package,
the worlds first small outline 32-bit solution. The low ON-resistance of the
QS34X2245 allows inputs to be connected to outputs without adding
propagation delay and without generating additional ground bounce noise.
Internal 25Ω resistors reduce reflection noise in high-speed applications.
When Output Enable (OEn) is low, the switches are turned on, connecting
bus A to bus B. When OEn is high, the switches are turned off. This device
is ideally suited for 32/64 bit applications where board space is at a premium.
QuickSwitch devices provide speeds an order of magnitude faster than
conventional logic devices.
The QS34X2245 is characterized for operation at -40°C to +85°C.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A7
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
OE
1
OE
3
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
OE
2
OE
4
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
B
24
B
25
B
26
B
27
B
28
B
29
B
30
B
31
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
MARCH 2002
DSC-5556/3
IDTQS34X2245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
NC
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
GND
NC
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
GND
NC
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
V
CC
OE1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
V
CC
OE2
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
V
CC
OE3
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
V
CC
OE4
B
24
B
25
B
26
B
27
B
28
B
29
B
30
B
31
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
Description
Supply Voltage to Ground
DC Switch Voltage Vs
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤
20ns)
DC Output Current
Maximum Power Dissipation (T
A
=70°C)
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
1.4
–65 to +150
Unit
V
V
V
V
mA
W
°C
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Vcc terminals.
3. All terminals except Vcc.
(T
A
= +25°C, f = 1.0MH
Z
, V
IN
= 0V, V
OUT
= 0V)
Pins
Control Pins
Quickswitch Channels (Switch OFF)
Typ.
3
7
Max.
(1)
4
8
Unit
pF
pF
CAPACITANCE
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
OEn
An
Bn
Output Enable
Data I/Os
Data I/Os
Description
FUNCTION TABLE
(1)
OEn
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Outputs
Disconnected
An = Bn
MILLIPAQ
TOP VIEW
2
IDTQS34X2245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 5.0V ±5%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
(3)
V
P
Parameter
Input HIGH Level
Input LOW Level
Off-State Output Current (Hi-Z)
Switch ON Resistance
Pass Voltage
(2)
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
0V
≤
V
OUT
≤
V
CC
, Switches OFF
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
V
CC
= Min., V
IN
= 2.4V, I
ON
=15mA
V
IN
= V
CC
= 5V, I
OUT
= -5µA
Min.
2
—
—
—
18
18
3.7
Typ.
(1)
—
—
—
—
23
25
4
Max.
—
0.8
±1
±1
35
40
4.2
Unit
V
V
µA
µA
Ω
V
Input LeakageCurrent (Control Inputs)
(2)
0V
≤
V
IN
≤
V
CC
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
2. Pass Voltage is guaranteed but not production tested.
3. R
OUT
changed on March 8, 2002. See rear page for more information.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
80
R
ON
(ohms)
70
60
50
40
30
20
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
3
IDTQS34X2245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Control Input HIGH
(2)
Dynamic Power Supply Current per MHz
(3)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or Vcc, f = 0
V
CC
= Max., V
IN
= 3.4V, f = 0
V
CC
= Max., A and B pins open
Control Inputs Toggling at 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TLL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
∆Icc.
3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.
Max.
12
1.5
0.25
Unit
µA
mA
mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5.0V ± 5%;
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise noted.
Symbol
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
Data Propagation Delay
(1,2)
An to/from Bn
Switch Turn-on Delay
OE
to An/Bn
Switch Turn-off Delay
(1)
OE
to An/Bn
0.5
—
5.2
ns
Parameter
Min.
(1)
—
0.5
Typ.
—
—
Max.
1.25
6.6
Unit
ns
ns
NOTES:
1.
Minimums are guaranteed but not production tested.
2.
The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone
is of the order of 1.25ns for C
L
= 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to
the system. Propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side of the switch and its interaction with the load
on the driven side.
4
IDTQS34X2245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXXX
Device Type
XX
Package
X
Process
Blank
Industrial (-40°C to +85°C)
Q3
Q3G
80-pin Millipaq
80-pin Millipaq - Green
34X2245
High-Speed CMOS Quickswitch
32-Bit Multiwidth Bus Switches
As per PCN L0201-02, the Output Resistance (R
ON
) specifications have changed as of March 8, 2002. The original specifications were:
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